Costar® Isotip Filtered Tips feature an inert, hydrophobic barrier that prevents aerosolised contaminants from contacting pipettor shafts. Isotips are ideal for applications where avoidance of cross contamination is critical, such as DNA amplification and radioisotope handling. All Filtered Tips are packaged sterile and are certified RNase/DNase-free and non-pyrogenic. The Isotips Plus (Cat. No. 4810) is designed for use with 2-20 µl, 10-100 µl, and 20-200 µl pipettors, eliminating the need to stock three different filter tips. Packaging: 100/rk 1000/cs